X11 drag & drop after drop behavior

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Drag-drop a file results in the dragged icon to be "stuck" in a persistent way.

I've found another issue with a video showing the exact same effect:
tauri-apps/tauri#11343 (comment)

A quick printf shows the current implementation does send XdndFinished after a drop.
Any ideas?

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Inspiration: In this tutorial / code example, they check for the xdnd version and act differently depending on the version.
https://github.com/ColleagueRiley/X11-Drag-n-Drop

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Note: The observed "stuck icon" was seen on Ubuntu 24.04 using the default desktop "Ubuntu on Xorg" (no Wayland involved). The version field in the client message tells version 5, which is the same I see on systems where it does work. The bug is not reproducible on every X11 installation, it's yet unclear what's different.